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Public advisoryEdit

POST-TROPICAL CYCLONE BILL ADVISORY NUMBER 22

WIKI-HURRICANES FORECAST CENTER

400PM CDT SAT JUN 20 2015

... BILL FINALLY GOES POST-TROPICAL ...

SUMMARY OF 400PM CDT...2100 UTC...INFORMATION

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LOCATION... 38.5N, 82.1W

ABOUT 25MI... 40KM WNW OF CHARLESTON, WEST VIRGINIA

MAXIMUM SUSTAINED WINDS...15 KT...20 MPH...30 KM/H

MINIMUM BAROMETRIC PRESSURE... 1005 MB...29.68 INCHES

PRESENT MOVEMENT...ENE AT 24 KT...28MPH...44 KM/H

DISCUSSION AND 48-HOUR OUTLOOK

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At 400 pm CDT, the center of Post-Tropical Cyclone Bill was located at 38.5N, 82.1W, or about 25 miles (40 kilometers) west-northwest of Charleston, West Virginia. Maximum sustained winds were 15 knots (20 mph, 30 km/h), with higher gusts. The minimum barometric pressure was 1005 millibars (hPa; 29.68 inHg), and the system was moving east-northeast at 24 knots (28 mph, 44 km/h). Bill is expected to slowly weaken as it accelerates east-northeastward before eventually merging with a frontal system.

NEXT ADVISORY

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This is the last advisory on Bill.

$$

Forecaster TheAustinMan

DiscussionEdit

POST-TROPICAL CYCLONE BILL DISCUSSION NUMBER 22

WIKI-HURRICANES FORECAST CENTER

400PM CDT SAT JUN 20 2015

After considerable time over land and unusual persistence, analyses show that the core of Bill has finally transitioned from warm-core to cold-core, meaning that Bill has completed a transition from a tropical to a post-tropical cyclone. Surface observations also show that Bill's circulation is also becoming less defined, though strong surface winds are still present. The convective structure of Bill remains intact, with convection still wrapping about the center. Despite Bill's designation at this time, Bill will remain a flood threat to the Mid-Atlantic states before it departs the continental United States later on.

INIT 20/2100Z 38.5N 82.1W 15KT 20MPH ... REMNANT LOW

12HR 21/0600Z 40.2N 77.0W 15KT 20MPH ... REMNANT LOW

24HR 21/1800Z 41.4N 71.4W 20KT 25MPH ... REMNANT LOW

36HR 22/0600Z ... MERGED WITH FRONTAL SYSTEM

$$

Forecaster TheAustinMan

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